How to say "double" in Japanese

• 倍ばいJLPT N4approx.Common
  no-adjectiveCovers 'double' in the quantitative sense: something twice as much as before, such as an amount, price, or number. Think 'twice as much' rather than 'two of something'.
  彼かれは私の倍ばい食たべた。↗

  He ate twice as much as I did.
• ダブルJLPT N2approx.Common
  no-adjectiveThe katakana loanword for 'double' in the sense of two of the same thing, as when ordering a double portion or a double shot of espresso.
• 倍増ばいぞうCommon
  noun, suru verb, transitive verb, intransitive verbRefers to doubling as an event or result: something growing to twice its previous level, as with sales, prices, or populations doubling. It is about the increase, not a doubled object.
  今年ことしの売り上うりあげは倍増ばいぞうと見込みこんでいます。↗

  Sales should double this year.
• 二重にじゅうCommon
  no-adjectiveUsed for 'double' meaning two layers or a twofold structure — a double layer of fabric, double doors, or something doubled on top of itself.
  歳月さいげつは距離きょり同様どうよう二に重じゅうの魅力みりょくを添そえる。↗

  Age, like distance, lends a double charm.
• 二塁打にるいだCommon
  nounThe baseball term for a two-base hit; if your 'double' is a batter's hit, this is the word. Outside baseball it is not used to mean 'double'.

Choose by sense: 倍 for twice as much, 「ダブル」 for two of the same thing, 倍増 for the act of doubling, 二重 for two layers, and 二塁打 only for a baseball double.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 倍ばいdouble
• ダブルdouble
• 倍増ばいぞうdoubling
• 二重にじゅうdouble
• 二塁打にるいだtwo-base hit
• 影武者かげむしゃbody double
• 折り曲げるおりまげるto bend
• 替え玉かえだまstand-in
• 代役だいやくsubstitute (actor)
• 倍するばいするto double
• 二倍にばいdouble
• 倍にするばいにするto double
• ツーベースdouble
• 二段にだんdouble
• 代り役かわりやくsubstitute actor
• 二組ふたくみtwo classes
• 二連にれんbipartite
• そっくりさんlook-alike
• 一倍いちばいdouble
• 吹き替えふきかえstand-in (actor)
• アベックback-to-back (e.g. home runs)
• Ｗダブリューdouble